XDA developers team member owl74 has find a method to unlock Galaxy Note II model N7100 and N7105. So, if you want to unlock your Android Galaxy Note II then go ahead with the guide below.
Warning: Continue with process to unlock Galaxy Note 2 N7100 / N7105 at your own risk.
Note: This guide also works to unlock Galaxy S III variants.
Unlock Galaxy Note 2 N7100 / N7105
Dial *#197328640# from your mobile phone, as its written here
Hidden menu wil appear now just navigate through “UMTS” > “Debug Screen” > “Phone Control” > “Network Lock” > “Options”
In “Options” screen, select “Perso SHA256 OFF” and wait for 30-60 seconds
Now to go back to “Network Lock” select “Options” and then choose “NW Lock NV Data INTIALLIZ” and again wait for 30-60 seconds and reboot your Galaxy Note II
Your Galaxy Note II is unlocked and you can use it with any SIM of any carrier service.